a = [-2.0 5.0 2.0 3.0 4.0 -1.0
    2.0 -1.0 -5.0 -2.0 6.0 4.0
    - 1.0 6.0 -4.0 -5.0 3.0 -1.0
    4.0 3.0 -6.0 -5.0 -2.0 -2.0
    - 3.0 6.0 4.0 2.0 -5.0 4.0
    2.0 4.0 4.0 4.0 5.0 -4.0]
b = [-3.0
    1.0
    - 6.0
    10.0
    - 6.0
    - 2.0]
x = a \ b
